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Product Description

Cylindrical roller bearings

Cylindrical roller bearings are separable, easy to mount and dismount especially more outstanding when they are used on bearings requiring interference fit between inner and outer rings with the shaft and housing. Cylindrical Roller Bearing is contacted with the fair line between the rollers and the raceway, which is of elimination of edge stress. Comparing with the Ball Bearings, with same boundary dimensions, cylindrical roller bearings have larger radial carrying capacity. Comparing with structure, this type of Bearing is more suitable for high speed rotation.

These type of bearings can carry large radial load, rotate at a high speed, there is no limit to axial displacement on shaft or housing, but cannot withstand axial load.

2. NJ0000 and NF0000 types Cylindrical roller bearings with ribs on both of inner rings and outer rings

NJ0000 and NF0000 types of bearings can allow axial displacement on the shaft or housing and carry little single-direction axial load; NU0000+HJ0000 types and NUP0000 type bearings can allow two-direction displacement within axial clearance range on the shaft and housing and carry little double-direction axial load.

3. RNU0000 Type Cylindrical roller bearings without inner rings.

RNU0000 types of bearing are applicable to the parts with limitation on radial size. The shaft surface can be directly used as raceway surface, the hardness, processing precision and surface roughness should be similar to those of ring raceway.

4.NAL0000 type and NNAL0000 type of long cylindrical roller bearings with double ribs on outer rings are applicable to petroleum machinery.

5.Four-row cylindrical roller bearings FC,FCD and FCDP types are mainly applicable to heavy-duty machines, such as rolling mills. These bearing designations are different from general rule.

Generally the cylindrical Roller Bearing shaft is not allowed to be tilted relative to the housing; while for single-row cylindrical roller bearings, when under light load, a relative2`tilt angle is allowed between the inner ring axial line and outer axial line. If the load is larger, the allowable error can be a little more, but should not exceed4`.

Tolerance and clearance

In accordance with requirement, Single row cylindrical roller bearings can be different tolerance classes. The tolerance value can be finding in the section Rolling Bearing Tolerance. For four row cylindrical roller bearings, the tolerance is normally P0, P6 and P5.

The Radial clearance of cylindrical roller bearing is as attached table 1.

Load-carrying capacity

The load-carrying capacity of cylindrical roller bearings with ribs on inner rings and outer rings are related to the magnitude of the radial load and lubrication methods. The maximum allowable axial load is as following:

Oil lubrication

Grease lubrication

Fap<0.4Fr

Fap-(N);Maximum allowable axial load

K-Factors related to bearing size series

2.3 series K=0.2;

22.23 series K=0.16.

C0r-(N);Basic static load rating

ng-Fr>0.1Cr,

(r/min);For the limit rotational speed of a bearing carrying a purely radial load, when Fr>0.1Cr, use the speed reduction factor to compensate the limit rotational speed.

n-(r/min).Actual operating rotation speed

As the axial load given by the above formula and under the following conditions, bearing with tolerance class 0 (except improved and enhanced types) can function normally:

The temperature of oil lubricate is55℃and grease lubricate is40℃, the highest is90℃. (The viscosity of lubricate oil is ν50=30mm2/s, and the dropping point of lubricate grease is170℃.)

If the axial load is acted internally, the allowable axial load can be doubled; when acted temporally, the allowable load can be increased by 2 times.

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